/**
 * @file
 *
 * @ingroup rtems_bsd_rtems
 *
 * @brief TODO.
 */

/*
 * Copyright (c) 2014, 2016 embedded brains GmbH.  All rights reserved.
 *
 *  embedded brains GmbH
 *  Dornierstr. 4
 *  82178 Puchheim
 *  Germany
 *  <rtems@embedded-brains.de>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <machine/rtems-bsd-kernel-space.h>

#include <sys/types.h>
#include <sys/lock.h>
#include <sys/reent.h>
#include <sys/systm.h>
#include <sys/syslog.h>

#include <stdio.h>

#include <rtems/bsd/bsd.h>

#define	VPRINTF_LOCK() _Mutex_Acquire(&vprintf_mtx)
#define	VPRINTF_UNLOCK() _Mutex_Release(&vprintf_mtx)

static const char * const log_priorities[] = {
	[LOG_EMERG] = "emerg",
	[LOG_ALERT] = "alert",
	[LOG_CRIT] = "crit",
	[LOG_ERR] = "err",
	[LOG_WARNING] = "warning",
	[LOG_NOTICE] = "notice",
	[LOG_INFO] = "info",
	[LOG_DEBUG] = "debug"
};

/* Use a <sys/lock.h> mutex due to the static initialization capability */
static struct _Mutex_Control vprintf_mtx = _MUTEX_INITIALIZER;

static void
default_putchar(int c)
{

	/*
	 * Output to the global stdout FILE object and not to the thread-local
	 * stdout FILE object.
	 */
	fputc(c, &__sf[1]);
}

static void
kvprintf_putchar(int c, void *arg)
{
	int *last;

	last = arg;
	*last = c;
	default_putchar(c);
}

static int
default_vprintf_handler(int level, const char *fmt, va_list ap)
{
	int n;
	int last;

	VPRINTF_LOCK();

	if (level != LOG_PRINTF) {
		const char *p;

		p = log_priorities[LOG_PRI(level)];

		while (*p != '\0') {
			default_putchar(*p);
			++p;
		}

		default_putchar(':');
		default_putchar(' ');
	}

	last = -1;
	n = kvprintf(fmt, kvprintf_putchar, &last, 10, ap);

	if (level != LOG_PRINTF && last != '\n') {
		default_putchar('\n');
	}

	VPRINTF_UNLOCK();
	return (n);
}

static int (*vprintf_handler)(int, const char *, va_list) =
    default_vprintf_handler;

int
rtems_bsd_vprintf_handler_mute(int level, const char *fmt, va_list ap)
{
	(void) level;
	(void) fmt;
	(void) ap;

	return 0;
}

rtems_bsd_vprintf_handler
rtems_bsd_set_vprintf_handler(rtems_bsd_vprintf_handler new_handler)
{
	rtems_bsd_vprintf_handler old_handler;

	VPRINTF_LOCK();
	old_handler = vprintf_handler;
	vprintf_handler = new_handler;
	VPRINTF_UNLOCK();
	return (old_handler);
}

int
rtems_bsd_vprintf(int level, const char *fmt, va_list ap)
{

	return ((*vprintf_handler)(level, fmt, ap));
}